[Ychris12138]

Ignoring a tag currently skips only its first line. Continuation lines are appended to the previous retained field, or stored as unknown content if no field precedes the ignored tag. For example, TI - Title\nN1 - ignored\ncontinued with ignore=["N1"] produces the title Title continued.

Track the ignored tag as the current field and skip its continuation lines. Parsing resumes normally at the next retained tag. Regression tests cover an ignored field at the beginning of a record, after a title or author, and the default ignored FN tag in WokParser.

Validation on Python 3.12:

• All four new regression cases fail on the original implementation.
• coverage run -m pytest --benchmark-skip: 40 passed, 2 benchmark tests skipped.
• coverage report -m: 99.6%, above the repository's 99.5% threshold.
• ruff check ., ruff format . --check, and git diff --check passed.

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